If your dog does not have high blood pressure then it is not entirely true that temaril-p and banadryl cannot be given together. The "temaril" part of Temaril p is an antihistamine very similar to benadryl so you many get extra sedation when the two are used together and you get no significant increased benefit from combining them. However it is not toxic or dangerous to give them together. I hope this helps, if not please feel free to ask more questions. Dr. Dan